Any other opinions and/or experiences?
I think that the basis of this little problem could be that the programmer of the user account system used the callsign as technical key to identify each user instead of a hidden primary key.
If that assumption is correct then it is a classic mistake to confuse between internal computer keys and data which the user or business may want to change.
I can only enjoy that others make the same mistakes as what I have done myself
At the end, Garry_007 is not that bad.